Chemical Name: 1-Piperazinecarboxylic acid, 4-[6-[(6-acetyl-8-cyclopentyl-7,8-dihydro-5-methyl-7-oxopyrido[2,3-d]pyrimidin-2-yl)amino]-3-pyridinyl]-, 1,1-dimethylethyl ester
Synonym: Palbociclib N-Boc Impurity
Smile: O=C1C(C(C)=O)=C(C)C(C=NC(NC2=CC=C(N3CCN(C(OC(C)(C)C)=O)CC3)C=N2)=N4)=C4N1C5CCCC5